Multiple-wire-drawing machine for drawing fine wires from suitable material



Nov. 27, 1928.

P. DARMSTADT ET AL MULTIPLE WIRE DRAWING mcnma FOR DRAWING FINE wmzs mom SUITABLE MATERIAL Filed 1928 2 Shuts-Sheet. 1.

I Nov. 27, 19221 1,693,224 P. DARMSTADT ETAL MULTIPLE WIRE DRAWING nouns ronpaume rm: vmuss FROI sun-Ann: mun.

Filed Jan. 11, 1928 2 ShutFSheot 2 &

l Mom ATTORA/g-K;

p sted N...27,1928y A A I 1,693,224 UNITED STATES PATENT OFFICE.

PETER DAEMsrAm, wILnELM srEoMANN, ANI VALENTIN wEIL, or EEGHEN. HEIM, NEAn rBANxEoRroN-mnE-MAI GERMANY, ASSIGNORS ro THE 1mm DBAH'I'INDUSTRIE PETER DARMsTAn'r a 00. G. M. B. H., or IRANxEoBr-oN-rnE- MAIN, GERMANY. I

MULrnLE-wmE-nEAwINo MACHINE FOR DRAWING FINE wmEs FROM suIrAnEE 1 MATERIAL.

Application filed January 11, 1928, Serial No. 245 834, and 111 Germany February 28, 1927-.

The subject of the present invention is a than 180. Practical results have shown multiple wire drawing machine for drawing that an angle of bending considerably below fine wires from suitable material, in which 180 suflices for drawing, for example, with- 55 the size of the angle of bending, with which out trouble nickel wires of 0.1 mm. diameter...

5 the wire bears firmly on the drawing rolls The drawing rolls or drawing rollers may or drawing rollers arranged between each be arranged in any suitable manner, accordpair of drawing stones or dies, is less than ng to the construction of the machine which 180; in comparison with the usual drawing 1s used. They ma be arranged behind one do machines, in which this angle of bending is another, side by si e or one over the other, or

180 or more. The machine known hitherto, also behind one another and side by side or particularlywhen using a. high speed of roone above the other. In addition to the actation of the drawing members, operate untual' drawing rolls or drawing rollers guideconomically by reason of the frequent ing or reversing rolls or rollers may also be 65 breakage of the thin wires caused by the too provided around which the wire passes looselarge angleof bending. In order to remedy ly and which serve to reverse the direction of this defect it has already been suggested to pull ofthe wire or to guide the wire in a consubd-ivide a large angle of bending of more -tinuous or circular path. These guiding or than 180 into a plurality of small angles of reversing rolls do not impart any work to the 70 bending-the sum of the angles of bending drawing system, and therefore do not re-- however always amounting to more than quire a. mechanical drive. In connection 180-but the breakage of the thin wires with these the angle of bending may be of still occurs too frequently. As drawing rolls any suitable size as the wire is not subjected or drawing rollers in the sense of the inven- -to an additional strain and the breakage of 75 tion there are only to be understood those the thin wire, for the reasons set out above rolls or rollers against which the thin wire is not to be feared.

to be drawn bears firmly and which impart The angle of bending of the wire around work to the drawing system by mechanical the several drawing rolls or drawing rollers drive, and therefore must overcome the drawcan be made progressively smaller according 80 ing resistance of the wire in the drawing to its gradual reduction in cross section and i stones or dies. In addition to the purely strength. The adjustment of the angle of drawing strain the wire also always receives bending necessary at any time can for this an additional strain on the drawin rolls purpose be effected by relatively adjusting or drawing rollers which increases with the the drawing members, or in machines havsize of the angle or bending with which it ing separate guiding systems, by adjusting 35 bears firmly on these, accordingtothe known the drawing members and/or the guiding formula for belt drives,,and when a predetermembers relatively to one another. All the mined limit is exceeded must lead to the operative parts, for the purpose of adjusting breakage of the wires. the machine for different drawing ranges or go For the roduction of fine wires, angles of for producing wires of difi'erent diameters, bending oi the magnitude of and more are preferably arranged so as to be exchangeas previously used, whether subdivided or able. not, are therefore unsuitable as the total On the periphery of the drawing rolls, or strain to which the thin wire may be subdrawing rollers we prefer to provide either 9 jected may reach an amplitude which exceeds fixed rings or loose rings driven by friction the tensile strength still existing at the points over which the wire is guided and which can 1 subjected to strain so that it must break. be conveniently replaced or exchanged after According to the present invention this wear. Loose rings driven by friction also disadvantage is overcome in that the angle serve for equalizing any stoppages which may )0 of bending by means of which the wires firmoccur in the uninterrupted drawing of the ly bear agalnst drawing rolls or drawing wires and which may be caused by failure rollers located between each two drawing of thevarious drawing rolls or drawing rollstones or dies, is in all cases made smaller' ers to deliver or take up the wire quite uniformly. According to the tightening or yielding of the wire and the increase, reduc-' tion or ceasing of friction due. thereto between the rings and the peripheral surface of the drawing rolls or drawing rollers, equalization of the difference in speed between each pair of drawing stones or dies will be obtained during the progressof the drawing operation.

The invention is illustrated in different examples of'application and construction in the accompanylng drawings, wherein: I

Figure 1 is an elevation of a multiple wire drawing machine in which the wire is drawn in a continuous operation through the bores of a number of drawing dies arranged one behindthe other, whichbores become smaller from the unwinding coil to the winding coil the wire being fed by means of drawing rollers mounted between each pair of drawing dies and driven in any suitable manner.

Figure l is an end elevation of the cam drive for the wire guide on the winding spool.

Figure 2 shows diagrammatically the ar-' rangement of the drawing rolls in such a machine having drawing rolls of the same diameter which rotate at different speeds and in which the angle of bending is smaller towards the side of the winding roll.

Figure 3 showsdiagrammatically a construction in which the drawing rolls have a diameter which is increased towards the winding spool and rotate at the same speed.

Figure 4 shows a diagrammatic illustration of a formof construction with two drawing rolls between each pair of drawing dies.

Figure 5 shows a diagrammatic illustration of a form of construction with .two rows of drawing rolls arranged one above the other and a reversing guide roll for returning the wire, so as to dispose a long drawing distance within a short space.

Figure 6 is a diagrammatic end elevation of a form of construction with drawing dies arranged side by side, a number of drawing rollers running in the same direction and a guide roller for returhing the wire in a circle towards the next succeeding drawing dies.

Figure 7 shows a diagrammatic perspective end elevation of a drawing roller and two guide rollers, and

Figure 8 is a diagrammatic end elevation of the same form of construction, which in combination with that illustrated in Figure 7 shows how, by adjusting a guide roller, the

" angle of bending at said roller may be altered.

In all the figures a indicates the drawing dies, b the drawing rolls ordrawing rollers, 0 the guide rolls or rollers, d the wire to be drawn, e the unwinding spool and f the winding spool. The angle of bending at the drawing rolls or drawing rollers is shown shaded in thin lines for the sake of greater clearness.

For the same reason the guide rolls or rollers are shaded. with crossing lines.

In Figure 1 9 indicates the'bearing blocks for the drawing rolls or rollers 12 and h those for the drawing dies a. These blocks are formed as slides and are relatively movable and adjustable on the base plate i of the ma chine. The drawing dies aare mounted on the supporting blocks h preferably in universal ball joints so that an accurate directing adjustment of the die bores relatively to the drawing direction of the Wire can be effected. 7c is a tension roller for the wire to be drawn from the spool e and Z the guide roller for the wire passing on to the spool f and uniformly wound thereon. The support m for the guide roller Z is uniformly reciprocated in accordance with the amount of spool length in slide guides by means of suitable gearing a with a cam member 0 and lever transmission mechanism p (see also Figure l The drawing rolls or rollers are driven by means of crossed belts from the main shait r in the same direction at a rotary speed which increases towards the winding spool f. The adjustment of the drawing rolls or rollers b is effected in this construction only in a horizontal direction.

In the forms of construction according to Figures 2 and 3 the drawing rolls or rollers Z) are movable and adjustable both in a horizontal and in a vertical direction and are so adjusted that the angles of bending become smaller from. the unwinding spool to the winding spool in accordance with the reduction of cross section of the wire. According to Figure 2 the drawing rolls or rollers b all have the same diameter and according to Figure 3 their diameters increase progressively towards the winding spool. In order to compensate forthe increasein length of the wire towards the winding spool f during the drawing operation, the drawing'rolls or rollers, according to the arrangement in Figure 2 must rotate at an increasing speed, whereas according to the arrangement in Figure 3 they. may be driven at a constant speed of retation.

According to Figure 4 where the drawing dies and drawing rolls or rollers are arranged one behind the other, the drawing operation is facilitated by arranging two drawing rolls between two successive dies. The drawing rolls or rollers asarranged in'Figure 5 correspond with the arrangement according to Figure 1. The distance of drawing is however do'ubled by superimposing two rows oi: drawing rolls or rollers, and a scparate guide or return roll or roller 0 is provided over which the wire (1 is guided loosely back to the lower row of drawing members. The guide roll or roller 0 rotates loosely. It could however also be driven but in this case would have to be driven at such a speedthat it does not exert anyv pulling action on the wire.

In the forms of construction according to Figures 6,7 and 8 the drawing dies a are arranged side by side and separate guiding Inc Eli

rolls or rollers c are providedover which the bore of the laterally disposed succeeding drawing dies.

According to Figure 6 only one guide roll or rollercc is provided and opposite this are four drawing rolls or rollers b which all rotate in the same direct-ion. The drawing dies (1 are arranged between the guide roll a and the first of the four drawing rolls 1), a suitable number of which are provided, purpose of facilitating the drawing operation as in the construction according to Figure 4.

- According to Figures 7 and 8 there are rovided in addition to a single drawing r0 1 or roller 1;, two guide rolls or rollers c and these are so arranged in relation to the drawing roll or roller that by a relative variation of the position of all the rolls or rollers the angle of bending on the drawing roll or roller 6 can be varied.

Figure 8 in conjunction with Figure 7 is ada ted to show how by lateral movement of the ower guide roll 0 the angle of bending on the drawing roll is enlarged relatively to that in the arrangement according to-Figure 7. Instead of relatively moving all the rolls or rollers either only the drawing roll can be movably mounted in relation to the guide rolls, or the latter or one thereof relatively to the drawing roll. For purposes of illustration (see Fig. 7) a bearing block similar to those provided in Figure l, is shown for carrying and adjusting the position of the upper guide roll 0. The shaft 8 of the drivroll and the shaft 8 of the lower guide may be mounted in the same fashion as the upper guide roll.

aving now described our invention, we wish it to be understood that-various changes in the arrangement and combination of parts may be made, which changes are to be limited only by the scope of the appended claims.

We claim:

1. In a multiple wire drawing machine for drawing fine wires, the combination, with a plurality of dies, of a drawing roll between each pair of said dies, the arrangement being such that the wire to be drawn bears against each of said drawing rolls at an angle of less than 180, the angle of bending on each drawing roll being smaller than the angle of bending around the previous drawing roll according to he reduction in cross-section of the wire.

2. In a multiple wire drawing machine, a

for the d plurality drawing drawing rolls being alternately disposed above and below successive pairs of dies and arranged for only partial peripheral contact with the .wire, the wire thuspassing from a die over one roll to-a second die and thence from said second die under a roll to a third die, and means for adjusting the said rolls and die relatively to each other for changing the angles ofibending of the wire between the of pairs of drawing dies, a sin 1e 3. In a multiple wire drawing machine, in combination with a set of drawin dies, drawing rolls mounted between said dies and arranged for only partial peripheral contact with the wire, separate guide rolls for guiding the wire through large distances of drawing, means for adjusting the drawing rolls and the, ide rolls relatively to each other to va e angle of partial peripheral contact o the wire with the drawing rolls, and universal ball joints, the dies being mounted in said joints in order for their bores to automatically align themselves with the directions of travel of the wire as said directions vary with changes in the angles of par-.

tial peripheral contact.

4. In a machine as defined in claim 2, universal ball joints, the dies being mounted in said joints in order for their bores to automatically align themselves with the directin of travel of the wire as said direction varies with the angle of bending.

5. In a wire drawing machine, two dies through which the wire is adapted to pass successively, and a drawing roll arran ed to engage the wire on its way from the rst of said dies to the second, along a peripheral contact portion of less than 180, the wire passing directly from the first die to the drawing roll and directly from the drawing roll to the second die.

6. A multiple wire drawing machine comprising a lurality of dies through which the wire is a apted to pass successively, and a drawing roll mechanism arranged to engage the wire on its way from each of said dies to the next-, along a peripheral contact portion the angular extent of which decreases progressively between successive pairs of dies, as the cross-section of the wire is reduced.

In witness whereof we have hereunto set our hands;

PETER DARMSTADT. WILHELM STEGMANN. VALENTIN WEIL.

roll between each pair of dies, t 1e- 

